| 19.5.1990 | Zeltweg National | 27 | Kadett GSi 16V | Helmut Herzog | | raced |
| 17.6.1990 | 24 h Nürburgring | 16 | Omega | Niedzwiedz / Oestreich / Strycek | Opel Team Irmscher | 6th |
| 17.6.1990 | 24 h Nürburgring | 37 | Kadett GSi 16V | Schmidt / Thaler / Ostmann / Look | Deutsches Opel Team | DNF |
| 17.6.1990 | 24 h Nürburgring | 38 | Manta | Straßer / Priller / Burdenski | Scuderia Starnberger See | DNF |
| 17.6.1990 | 24 h Nürburgring | 39 | Manta | Kober / Kober / Köbeler / Sturm | | 52nd |
| 17.6.1990 | 24 h Nürburgring | 42 | Manta | "Garuda" / Becker | | DNF |
| 17.6.1990 | 24 h Nürburgring | 43 | Manta | Schmittner / Hass / Färber | | 40th |
| 17.6.1990 | 24 h Nürburgring | 44 | Kadett GSi 16V | Rittmeier / Viebranz / Kaczmarek / Pötschke | PSV Remscheid 1920 e. V. | 41st |
| 17.6.1990 | 24 h Nürburgring | 45 | Kadett GSi 16V | Wagner / Simon / Wagner | | 107th |
| 17.6.1990 | 24 h Nürburgring | 46 | Kadett GSi 16V | Höhl / Hulverscheid / Kaufmann | Kissling Motorsport | DNF |
| 17.6.1990 | 24 h Nürburgring | 49 | Manta | Kasterka / Bayer / Kleinschmidt / Hartwig | | 114th |
| 17.6.1990 | 24 h Nürburgring | 50 | Manta | Upadek / Upadek / Schnurpfeil | | DNF |
| 17.6.1990 | 24 h Nürburgring | 51 | Manta | Wallraf / Lingen / Paul / Enderle | SFG Köln e.V. | 110th |
| 17.6.1990 | 24 h Nürburgring | 54 | Manta | Müller / Hoffmann / Kalenborn / Buttenhoff | Divinol Motor Oils | 112th |
| 17.6.1990 | 24 h Nürburgring | 57 | Kadett GSi 16V | Jansen / Irnich / Jonas | | 94th |
| 17.6.1990 | 24 h Nürburgring | 84 | Corsa | Eichenauer / Messina / Vier | | 111th |
| 17.6.1990 | 24 h Nürburgring | 130 | Kadett GSi 16V | Mölig / Peil / Cordlandwehr | Kissling Motorsport | 34th |
| 17.6.1990 | 24 h Nürburgring | 131 | Kadett GSi 16V | Franck / Gillen / Hartz | | 77th |
| 17.6.1990 | 24 h Nürburgring | 132 | Kadett GSi 16V | Reiter / Schwarz / Piccolomini | AC Inzell e. V. | DNF |
| 17.6.1990 | 24 h Nürburgring | 135 | Kadett GSi 16V | Praschma / Strycek / Bartlick / Ilgner | | 83rd |
| 17.6.1990 | 24 h Nürburgring | 140 | Kadett GSi 16V | Mamerow / Bokhoven / Bolderheij / Krepschik | Mamerow Automobiltechnik | DNF |
| 17.6.1990 | 24 h Nürburgring | 141 | Kadett GSi 16V | Rittmeier / Viebranz / Kaczmarek / Pötschke | PSV Remscheid 1920 e. V. | 21st |
| 17.6.1990 | 24 h Nürburgring | 142 | Kadett GSi 16V | Nettesheim / Schlehecker / Morawitz | | 97th |
| 17.6.1990 | 24 h Nürburgring | 143 | Kadett GSi 16V | Senge / Kudrass / Jansen / Fritzsche | | 36th |
| 17.6.1990 | 24 h Nürburgring | 144 | Kadett GSi 16V | Stark / Kirchhoff / Frenzel | | DNF |
| 17.6.1990 | 24 h Nürburgring | 147 | Kadett GSi 16V | Berkholz / Berkholz / Koch | Rallye Club Böblingen | 89th |
| 17.6.1990 | 24 h Nürburgring | 148 | Kadett GSi 16V | Katthöfer / Assmuth / Quester | Mühlner Motorsport GmbH | DNF |
| 17.6.1990 | 24 h Nürburgring | 149 | Kadett GSi 16V | Kummle / Kummle / Meier | | DNF |
| 17.6.1990 | 24 h Nürburgring | 151 | Kadett GSi 16V | Geitz / Geitz / Benning / Fritzsche | Heinrich Honert jr. Abnorme Schrauben | 20th |
| 17.6.1990 | 24 h Nürburgring | 152 | Kadett GSi 16V | Lüdders / Fassnacht / Luther | MC Kaltenkirchen e. V. | 49th |
| 17.6.1990 | 24 h Nürburgring | 153 | Kadett GSi 16V | Haupt / Schlacks / Hirsch | Kreis Opel Sport | 58th |
| 17.6.1990 | 24 h Nürburgring | 154 | Kadett GSi 16V | Baumgarten / Glanz / Dobenecker / Boden | Deutsches Opel Team | 81st |
| 17.6.1990 | 24 h Nürburgring | 155 | Kadett GSi 16V | Droste / Möller / Wüst / Sonnauer | Deutsches Opel Team | 35th |
| 17.6.1990 | 24 h Nürburgring | 157 | Kadett GSi 16V | Fritzsche / Fritzsche / Senge | Mantzel Opel Tuning | DNF |
| 17.6.1990 | 24 h Nürburgring | 161 | Kadett GSi 16V | Lambert / Vogt / Zilles | | DNF |
| 17.6.1990 | 24 h Nürburgring | 162 | Kadett GSi 16V | Holtkamp / Krauskopf / Aichmann | D.A.M.C. 05 e. V. | 91st |
| 17.6.1990 | 24 h Nürburgring | 163 | Kadett GSi 16V | Böhm / Schulze-Ardey / Mamerow / Schmidt | Mamerow Automobiltechnik | DNF |
| 17.6.1990 | 24 h Nürburgring | 165 | Kadett GSi 16V | Turner / Briggs / Wolf / Werner | Sportfahrerkreis Rheinhessen | 78th |
| 17.6.1990 | 24 h Nürburgring | 166 | Kadett GSi 16V | Humala / Granlund / Leppäniemi | Biolan Oy | 70th |
| 17.6.1990 | 24 h Nürburgring | 168 | Kadett GSi 16V | Heinrich / Schellhaas / Ofak | | 42nd |
| 17.6.1990 | 24 h Nürburgring | 172 | Kadett GSi 16V | Hötzinger / Kuppi / Stern | Scuderia Starnberger See | 59th |
| 15.7.1990 | Zeltweg National | 21 | Kadett GSI | Leopold Mitterhuber | | raced |
| 15.7.1990 | Zeltweg National | 23 | Kadett GSI | Hans Pondorfer | | raced |
| 15.7.1990 | Zeltweg National | 27 | Kadett GSI | Otto Fieg | | raced |
| 15.7.1990 | Zeltweg National | 31 | Kadett GSi 16V | Helmut Herzog | | raced |
| 22.7.1990 | 24 h Spa | 70 | Kadett GSi 16V | Noirhomme / Henry de Frahan / Nirrengarten | Opel Team Belgium | NC |
| 22.7.1990 | 24 h Spa | 71 | Kadett GSi 16V | Bruynoghe / Wauters / Meerschaut | Opel Team Belgium | DNF |
| 22.7.1990 | 24 h Spa | 72 | Kadett GSi 16V | van Esch / Ménage / Schreurs | Opel Team Belgium | 25th |
| 22.7.1990 | 24 h Spa | 73 | Kadett GSi 16V | Cremer / Van Rompuy / Willems | Opel Team Belgium | 18th |
| 22.7.1990 | 24 h Spa | 74 | Kadett GSi 16V | Thiry / Jamar / Haugg | Opel Racing | 16th |
| 22.7.1990 | 24 h Spa | 86 | Omega 3000 24v | Devrin / Devrin / Schoos | Ecurie Baudoin Visetoise | DNF |
| 22.7.1990 | 24 h Spa | 97 | Kadett | Katthöfer / Quester | Muhlner Motorsport GmbH | DNA |
| 12.8.1990 | 500 km Kemora | 19 | Manta B M88 | Knezevic / Kreivi | - | DNF |
| 26.8.1990 | Nordic SS Jyllandsringen | | Kadett GT/E | Pentti Piispanen | | 12th |
| 26.8.1990 | Nordic SS Jyllandsringen | | Kadett GT/E | Preben Jensen | | 11th |